64bit PCI NIC?

Does a 64bit PCI NIC like the adaptec DuraLAN offer any kind of
performance benefit int latency or bandwidth then say a tuplip or intel
card? We are looking into the cards and were wondering what other peoples
experiences are with them. If anybody has number on them I would be happy
to see them. Thanks
--
Judd Tracy
Institute for Simulation and Training
jtracy at ist.ucf.edu
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